The resistance to change of observing.
D000818:Animals; D001070:Appetitive Behavior; D001245:Association Learning; D001288:Attention; D003118:Color Perception; D010856:Columbidae; D004193:Discrimination Learning; D005108:Extinction, Psychological; D009042:Motivation; D009949:Orientation; D010364:Pattern Recognition, Visual; D012055:Reinforcement Schedule